Interview Question

What is Elasticsearch?

Elasticsearch is an open source tool with search engine compliant to restful webservice. Elasticsearch is built on Apache Lucene and released under Apache license. It is based on java and can search and index document files in diverse formats.

What is Logstash?

Logstash is an open source product which picks data from multiple sources simultaneously and is used for server-side processing. Logstash transforms data which it picks and then sends to your stash like Elasticsearch.

What is Kibana?

Kibana is an open source visualization dashboard for Elasticsearch, where we can see all of our application logs picked up by elasticsearch. Users can produce bar, line and scatter plots, or pie charts and maps on high of enormous volumes of information.

Explain ELK architecture?

ELK is open source product for searching and analyzing data in any format and with any type of source designed with Elastic feature visualize that data in real-time. It make the use of Logstash for log aggregation, Elasticsearch for searching and Kibana for visualizing and analyzing data.

What is the use of logstash?

Logstash works as a log shipping agent and also helps us to filterize our logs. It picks up the logs data and converts them into json and transfers the data to elasticsearch, because elasticsearch understands the data in json format.

What is meant by filebeat?

Filebeat plays a very important role in this structure. Filebeat is a lightweight shipper which is installed as an agent for forwarding and centralizing log data. Installed as an agent on your servers.